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Willin
Samba Member
Joined: October 10, 2019
Posts: 264
Location: Bozeman Mt
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 Posted: Wed Oct 18, 2023 6:37 pm Post subject: Re: Brake Warning Light |
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Thank you all!
Will do! |
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W1K1
Samba Member
Joined: March 04, 2004
Posts: 5294
Location: Southern AB
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| Posted: Thu Oct 19, 2023 9:26 am Post subject: Re: Brake Warning Light |
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| telford dorr wrote: |
Here's your indicator:
It's a little different than the previous indicator: the center pin (15) is 12 volts from the ignition switch fuses instead of ground; ground is pin 31. The 'K' terminal goes to the brake light switches. When it has 12 volts applied, the transistor turns on, illuminating the light. Pin 61 goes to the parking brake switch. When it is grounded, diode D2 turns on the light. Diode D1 tries to protect the transistor if you hook it up wrong. |
I have this light in my dash , but it's the 71 with only 3 wires can I make the later one function for now?
_________________
1973 super 2110cc
1965 squareback 1500E-sold
1971 bay window westy- EJ2.5 subi swap |
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telford dorr
Samba Member
Joined: March 11, 2009
Posts: 3625
Location: San Diego (Encinitas)
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| Posted: Thu Oct 19, 2023 10:00 am Post subject: Re: Brake Warning Light |
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Sure. Just insulate the blue 61 wire and leave it disconnected.
_________________
'71 panel, now with FI
'Experience' is the ability to recognize a mistake when you're making it again - Franklin P. Jones
In theory, theory works in practice; in practice, it doesn't - William T. Harbaugh
When you're dead, you don't know you're dead. The pain is only felt by others.
Same thing happens when you're stupid. - Philippe Geluck
More VW electrical at http://telforddorr.com/ (available 9am to 9pm PST) |
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W1K1
Samba Member
Joined: March 04, 2004
Posts: 5294
Location: Southern AB
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| Posted: Thu Oct 19, 2023 10:45 am Post subject: Re: Brake Warning Light |
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I tried to wire just the 3 wires, and it comes on when I start the bus and shuts off when I push the brake 
_________________
1973 super 2110cc
1965 squareback 1500E-sold
1971 bay window westy- EJ2.5 subi swap |
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telford dorr
Samba Member
Joined: March 11, 2009
Posts: 3625
Location: San Diego (Encinitas)
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| Posted: Thu Oct 19, 2023 12:12 pm Post subject: Re: Brake Warning Light |
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| W1K1 wrote: |
| I tried to wire just the 3 wires, and it comes on when I start the bus and shuts off when I push the brake |
- Unplug the connectors (or the red wires, if the connectors are missing) at the brake switches and see if the indicator is dark. If so, reattach the connections, one switch at a time, and see if one of them causes the indicator to light. If so, there's a problem with that switch or its connections.
- If unplugging the brake switches doesn't cause the indicator to go dark, unplug the red ('K') wire at the indicator. If this causes darkness, then the issue is in the wiring somewhere. Otherwise, something's bupkis with the indicator itself.
Basically, applying 12 volts to the 'K' terminal causes the indicator to illuminate; no connection or 0 volts should cause it to go dark. All this assumes the black wire is connected to the 15 terminal and the brown wire is connected to the 31 terminal on the indicator. The black wire should have 12 volts on it relative to ground and to the brown 31 wire.
_________________
'71 panel, now with FI
'Experience' is the ability to recognize a mistake when you're making it again - Franklin P. Jones
In theory, theory works in practice; in practice, it doesn't - William T. Harbaugh
When you're dead, you don't know you're dead. The pain is only felt by others.
Same thing happens when you're stupid. - Philippe Geluck
More VW electrical at http://telforddorr.com/ (available 9am to 9pm PST) |
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Willin
Samba Member
Joined: October 10, 2019
Posts: 264
Location: Bozeman Mt
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| Posted: Sat Feb 17, 2024 2:24 pm Post subject: Re: Brake Warning Light |
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Thanks to Mr. Dorr, I got my brake warning light fixed!
I went and ordered a couple of the 1n4148 diodes, from Digikey. 10 cents apiece ,with $7 postage.
I have a good friend who is very knowledgeable in these matters.
First he figured out which diode was bad. It was the little one tucked in behind a little black box. Undid the solder. Got the old one out.
And worked the new one in.
And soldered!
Put in the bus. Success! The light goes out as it should when bus is running.
The blue lens in my light is made from a plastic six pack holder.
Thanks again to Mr. Dorr!
_________________
73 bus. Org. 1700 with dual Weber 40 idfs, bus header with Empi qp muffler, CB magnaspark 2 " ready to run kit". |
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JAYSTALLARD
Samba Member
Joined: April 28, 2024
Posts: 2
Location: New York
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| Posted: Thu Jun 26, 2025 7:41 am Post subject: Re: Brake Warning Light |
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| I have an odd problem. My light remains on if I depress the brake. Then it goes off. It turns back on when I release the brake. The parking brake does not seem t effect it. Thoughts? |
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busdaddy
Samba Member
Joined: February 12, 2004
Posts: 52812
Location: Surrey B.C. Canada, but thinking of Ukraine
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| Posted: Thu Jun 26, 2025 8:12 am Post subject: Re: Brake Warning Light |
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Welcome!
I'd start by removing both switches and washing them out with brake cleaner, then flush out the entire system while bleeding it. It sounds like there's a lag on one of the switches, possibly caused by sediment accumulations.
_________________
Rust NEVER sleeps and stock never goes out of style.
Please don't PM technical questions, ask your problem in public so everyone can play along. If you think it's too stupid post it here
Stop dead photo links! Post your photos to The Samba Gallery!
Слава Україні! |
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JAYSTALLARD
Samba Member
Joined: April 28, 2024
Posts: 2
Location: New York
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| Posted: Thu Jun 26, 2025 1:55 pm Post subject: Re: Brake Warning Light |
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Just an FYI someone is selling both the lens and assembly on eBay:
https://ebay.us/m/nCKmDq
Best,
J
| Willin wrote: |
Thanks to Mr. Dorr, I got my brake warning light fixed!
I went and ordered a couple of the 1n4148 diodes, from Digikey. 10 cents apiece ,with $7 postage.
I have a good friend who is very knowledgeable in these matters.
First he figured out which diode was bad. It was the little one tucked in behind a little black box. Undid the solder. Got the old one out.
And worked the new one in.
And soldered!
Put in the bus. Success! The light goes out as it should when bus is running.
The blue lens in my light is made from a plastic six pack holder.
Thanks again to Mr. Dorr! |
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